// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//


#pragma once

#include <pollux/expression/function_call_to_special_form.h>

namespace kumo::pollux::exec {
    using RegistryType =
    melon::F14FastMap<std::string, std::unique_ptr<FunctionCallToSpecialForm> >;

    class SpecialFormRegistry {
    public:
        /// Registers 'functionCallToSpecialForm' for mapping user defined
        /// FunctionCallToSpecialForm subclass instances to user-defined
        /// FunctionCallToSpecialForm.
        void registerFunctionCallToSpecialForm(
            const std::string &name,
            std::unique_ptr<FunctionCallToSpecialForm> functionCallToSpecialForm);

        /// Removes all functionCallToSpecialForm registered earlier via calls to
        /// 'registerFunctionCallToSpecialForm'.
        void unregisterAllFunctionCallToSpecialForm();

        /// @brief Return null if the FunctionCallToSpeicalForm not exists
        /// @param name Function name
        /// @return FunctionCallToSpecialForm
        FunctionCallToSpecialForm * MELON_NULLABLE
        getSpecialForm(const std::string &name) const;

        std::vector<std::string> getSpecialFormNames() const;

    private:
        melon::Synchronized<RegistryType> registry_;
    };

    const SpecialFormRegistry &specialFormRegistry();

    SpecialFormRegistry &mutableSpecialFormRegistry();

    /// Registers 'functionCallToSpecialForm' for mapping user defined
    /// FunctionCallToSpecialForm subclass instances to user-defined
    /// FunctionCallToSpecialForm.
    void registerFunctionCallToSpecialForm(
        const std::string &name,
        std::unique_ptr<FunctionCallToSpecialForm> functionCallToSpecialForm);

    /// Removes all functionCallToSpecialForm registered earlier via calls to
    /// 'registerFunctionCallToSpecialForm'.
    void unregisterAllFunctionCallToSpecialForm();

    /// Returns true if a FunctionCallToSpeicalForm object has been registered for
    /// the given functionName.
    bool isFunctionCallToSpecialFormRegistered(const std::string &functionName);
} // namespace kumo::pollux::exec
